Nebraska's February BS/Chat Thread.
#758
02-08-2010, 07:27 AM
shawn, the reason they put them behind glass like that is all in the design. different enclosures give different sounds, and can affect how long the subs(s) will last. the most common is the sealed enclosure. this enclosure is the simplest to make, and requires the least amount of tuning, but the size of it can effect how your system sounds. it also will typically increase the life of you system because your sub has to fight the against the air pressure in the box, which limits its excursion, and makes it less likely for you to blow a speaker.
there are ported boxes too, which is like what you have shawn, with your fosgates. this requires, again some, but not too much tuning to make, as its basically allowing airflow from behind the sub. however, at higher volumes, and at lower frequencies, it can lead to over excursion and destroy your sub.
then there is the single bandpass set up, which is the setup like you see when the subs are under plexi. it requires a lot of tuning to build a good single bypass system. you have to know what size of enclosure to use to get the tone you want, then you you have to know the size of the venting to use so it lets the right tone out. the trouble with the bypass system, is that it is possible to over power your sub, and literally drive it to pieces and not know anything is wrong because the enclosure contains the sound. also this is the set up most typically used in home entertainment systems. it, like the sealed enclosure can help with sub longevity because one side is sealed.
then there is dual bandpass, which is like a single bandpass, but requires, a lot of knowledge, and a lot of tuning. it puts the set up of the single bandpass on both sides of the sub, so you must tune what TWO frequencies and tones you want the sound at. like the ported box, this can lead to over excursion and destroy a sub if youre gettin crazy with the power.
here, JL explains it a bit more in-depth, if you care to read.
JL Audio - Car Audio Systems
there are ported boxes too, which is like what you have shawn, with your fosgates. this requires, again some, but not too much tuning to make, as its basically allowing airflow from behind the sub. however, at higher volumes, and at lower frequencies, it can lead to over excursion and destroy your sub.
then there is the single bandpass set up, which is the setup like you see when the subs are under plexi. it requires a lot of tuning to build a good single bypass system. you have to know what size of enclosure to use to get the tone you want, then you you have to know the size of the venting to use so it lets the right tone out. the trouble with the bypass system, is that it is possible to over power your sub, and literally drive it to pieces and not know anything is wrong because the enclosure contains the sound. also this is the set up most typically used in home entertainment systems. it, like the sealed enclosure can help with sub longevity because one side is sealed.
then there is dual bandpass, which is like a single bandpass, but requires, a lot of knowledge, and a lot of tuning. it puts the set up of the single bandpass on both sides of the sub, so you must tune what TWO frequencies and tones you want the sound at. like the ported box, this can lead to over excursion and destroy a sub if youre gettin crazy with the power.
here, JL explains it a bit more in-depth, if you care to read.
JL Audio - Car Audio Systems
#761
02-08-2010, 07:49 AM
you have to tune to get it to produce the frequency you want. bandpass is a term to describe that the enclosure only lets out a certain "bandwidth" of sound. so like, a box can let out from 30 Hz to 150 Hz, but nothing above or below that. in other words, it lets the bandwidth pass through, so its a "bandpass enclosure".
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